B318A 2016 GMC Sierra Code - Left Rear Window Switch
Quick Answer
The driver and passenger window motors supply 12 V signal circuits to their respective window switches, when a window switch has been activated, a switch closes providing a ground to the appropriate signal circuit causing the voltage to drop to 0 V. Common causes include Faulty Left Rear Window Switch, Left Rear Window Switch harness is open or shorted, Left Rear Window Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B318A 2016 GMC Sierra indicates Left Rear Window Switch.
- Common causes
- Common causes include Faulty Left Rear Window Switch, Left Rear Window Switch harness is open or shorted, Left Rear Window Switch circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B318A 2016 GMC Sierra Description
The driver window master control switch also contains control switches for the passenger, left rear and right rear window functions. When a window switch is pressed, a serial data message is sent to the Body Control Module (BCM). The BCM examines the request and checks for messages from other power window motors that may prohibit window movement. If no prohibitive messages have been received, the BCM will send a serial data message to the passenger window motor or to the appropriate rear window switch which will perform the command as requested.
What are the Possible Causes of the DTC B318A 2016 GMC Sierra?
- Faulty Left Rear Window Switch
- Left Rear Window Switch harness is open or shorted
- Left Rear Window Switch circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B318A 2016 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B318A 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about B318A 2016 GMC Sierra Code
1. What does OBDII code B318A mean for a 2016 GMC Sierra Left Rear Window Switch?
The code B318A indicates a malfunction in the left rear window switch of a 2016 GMC Sierra.
2. What are the common symptoms of OBDII code B318A in a 2016 GMC Sierra Left Rear Window Switch?
Common symptoms include the left rear window being inoperable or functioning intermittently, the switch not responding to commands, or the window getting stuck in one position.
3. What are some possible causes of OBDII code B318A in a 2016 GMC Sierra Left Rear Window Switch?
Causes can include a faulty window switch, damaged wiring or connectors, a blown fuse, or issues with the window regulator or motor.
4. How can I diagnose the issue related to OBDII code B318A in my 2016 GMC Sierra Left Rear Window Switch?
You can start by checking the fuse related to the left rear window, inspecting the wiring and connectors for any damage, and testing the switch for proper functionality. If needed, a professional diagnostic tool can help pinpoint the exact issue.
5. What are some DIY repair tips for resolving OBDII code B318A in a 2016 GMC Sierra Left Rear Window Switch?
You may try cleaning the switch contacts, replacing the fuse if needed, or repairing any damaged wiring yourself. For more complex issues, it's recommended to consult a qualified mechanic.
6. Can I continue to drive my 2016 GMC Sierra with OBDII code B318A affecting the Left Rear Window Switch?
While the vehicle may still be operable, it's advisable to address the issue promptly to ensure the safety and functionality of the left rear window.
7. Is it safe to reset the OBDII code B318A without fixing the underlying problem in my 2016 GMC Sierra Left Rear Window Switch?
Resetting the code without resolving the root cause may temporarily clear the warning light, but the issue will likely reoccur. It's best to address the problem to prevent further complications.
8. How much does it typically cost to repair OBDII code B318A in a 2016 GMC Sierra Left Rear Window Switch?
The cost of repair can vary depending on the exact cause of the issue. Simple fixes like replacing a fuse or switch may be relatively inexpensive, while more complex problems could require professional intervention and incur higher costs.
9. Can a faulty left rear window switch trigger other OBDII codes in a 2016 GMC Sierra?
While it's possible for related issues to trigger additional codes, the B318A code specifically pertains to problems with the left rear window switch. Other codes may appear if there are separate malfunctions in the vehicle's systems.
10. Should I seek professional help to address OBDII code B318A in my 2016 GMC Sierra Left Rear Window Switch?
If you're unsure about diagnosing or repairing the issue yourself, or if the problem is complex, it's recommended to seek assistance from a qualified mechanic or dealership to ensure proper resolution.
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